線xian下xia支zhi付fu服fu務wu是shi指zhi公gong司si與yu實shi體ti特te約yue商shang戶hu簽qian訂ding受shou理li協xie議yi
，為wei商shang戶hu線xian下xia麵mian對dui麵mian交jiao易yi提ti供gong支zhi付fu和he交jiao易yi資zi金jin結jie算suan的de服fu務wu
，更geng可ke為wei商shang戶hu提ti供gong定ding製zhi化hua的de線xian下xia支zhi付fu解jie決jue方fang案an。